I know exactly what your problem is and there is an easy solution. A guy at my field had the same exact problem. The problem is that fuel will pool up in the carb/block and when you shake the plane or just land it, the fuel shakes loose and flames out the engine. DA will fix it for free if you ship it to them. I think they ship it back for free as well. It's a warantee fix. If you look at "Does your DA50 do this?" thread. See page 11 post #252 is where the solution is explained. Pic's of the new engine are on post #254. They change the location of the crank pressure pulse and rotate the carb 180 degrees. Post #217 shows an older engine without the mod.
My new DA50 has this already done. I think you can do this yourself as well.
http://www.rcuniverse.com/forum/m_17...11/key_/tm.htm (this is the DA50 thread).
http://www.rcuniverse.com/forum/m_30..._7/key_/tm.htm (this is a thread that has pic's of mine out of the box).
ORIGINAL: ougat
seeing that we have alot of specialists around could someone please help with the following
we have the engine mounted inverted with a custom build pitts exhaust on it. its brand new and still being run in. it starts very easy but for some reason if you pick up the tail wing to level the plane on the ground the revs drop, and if you shake the plane a bit the engine dies. we have tried putting it on an external tank. we have also turned the plane upside down and then the problem is worse. opened the carb and checked it out, there was a little dirt but not much to worry about, there is no air problems due to cowls as the plane is still on the ground with no cowl.
we have also leaned it and riched it out same problem
PLEASE help